<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="http://autumnfish.cn/static/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody" v-if="fruitList.length !== 0">
          <div class="tr" :class="{active: item.isChecked}" v-for="(item, index) in fruitList" :key="item.id">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td"> {{ item.price }} </div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" @click="sub(index)"> - </button>
                <span class="my-input__inner"> {{ item.num }} </span>
                <button class="increase" @click="add(index)"> + </button>
              </div>
            </div>
            <div class="td"> {{ item.num * item.price }} </div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>


        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isAll" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price"> {{ totalPrice }} </span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{ totalCount }} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-if="fruitList.length === 0">🛒空空如也</div>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>

  <script>
    const defaultArr = [
          {
            id: 1,
            icon: './img/火龙果.png',
            isChecked: true,
            num: 2,
            price: 6,
          },
          {
            id: 2,
            icon: './img/荔枝.png',
            isChecked: false,
            num: 7,
            price: 20,
          },
          {
            id: 3,
            icon: './img/榴莲.png',
            isChecked: false,
            num: 3,
            price: 40,
          },
          {
            id: 4,
            icon: './img/鸭梨.png',
            isChecked: true,
            num: 10,
            price: 3,
          },
          {
            id: 5,
            icon: './img/樱桃.png',
            isChecked: false,
            num: 20,
            price: 34,
          },
        ];
    const app = new Vue({
      el: '#app',
      data: {
        // 水果列表
        fruitList: JSON.parse(localStorage.getItem('fruitList')) || defaultArr
      },
      computed: {
        isAll: {
          set() {
            this.fruitList.forEach(item => item.isChecked = true);
          },
          get() {
            return this.fruitList.every(item => item.isChecked);
          }
        },
        totalPrice() {
          return this.fruitList.filter(item => item.isChecked).reduce((sum, item) => sum + item.num * item.price, 0);
        },
        totalCount() {
          return this.fruitList.filter(item => item.isChecked).reduce((sum, item) => sum + item.num, 0);
        }
      },
      methods: {
        del(idx) {
          console.log(idx);
          this.fruitList = this.fruitList.filter(item => item.id !== idx);
        },
        add(idx) {
          this.fruitList[idx].num++;
        },
        sub(idx) {
          if (this.fruitList[idx].num > 0)
            this.fruitList[idx].num--;
        }
      },
      watch: {
        fruitList: {
          deep: true,
          handler(newVal) {
            localStorage.setItem('fruitList', JSON.stringify(newVal));
          }
        }
      }
    })
  </script>
</body>

</html>